txid_current() forces a real xid

Right now, calling txid_current() causes a session to create a
non-virtual xid if not already assigned, so observing the xid creates
it, which seems kind of odd. Is that intended? Here is the C code:

TransactionId
GetTopTransactionId(void)
{
if (!TransactionIdIsValid(TopTransactionStateData.transactionId))
AssignTransactionId(&TopTransactionStateData);
return TopTransactionStateData.transactionId;
}

--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com

+ It's impossible for everything to be true. +